Now that etcd v3 has been out almost for 2 years

etcd team wants to enable ETCDCTL_API=3 by default
for upcoming v3.4 release (planned for this summer).

All v2 APIs and store will be still preserved until v4.
We just want to promote etcd v3 as a default option.


etcdctl set foo bar
ETCDCTL_API=3 etcdctl put foo bar


ETCDCTL_API=2 etcdctl set foo bar
etcdctl put foo bar

Please raise any issues or concerns if there's any.

Thanks all.

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